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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76db383a0efd15384f5eecc6c2193c3cb5fcda8cca6d5a06b66b1147c1b03b40' 
  AND token = 'K+gaiqfwVA0C2Uh5qcSWBv4kFPmtLSQBj6QW6d43I6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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