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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0634489f856ddd18aebe8ad793a8bd7766352e033f04a71c1ae33960948e11a' 
  AND token = 'Zjl3bIbr4/woC5ZWcPV/roeevQ4btSCHYbY9ZnE0vsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}