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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0216b788c93588d0fb3c269f98c8679922c92d64689fc98c20feee3948a51e9' 
  AND token = 'lB6wPY7xZviJA1rqdPTOFrjf4NJ9QIRrWFisa0tsS2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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