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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0551371f1c7f0cc9d41e4a9a726458e658eff9387e26e797c3861cee60df7a64' 
  AND token = 'tr5JSZPWoD2wMqxDigXA9/fqneSqUKphOjruj2GyL5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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