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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fa30407f4c40c00746ea59a9d739e4d2f44fd14d0a607437c19797ca9f6b19' 
  AND token = 'PSJoeeVmliZ8CGeDdLhvV4m1rJMUsmofubjgWDmQOtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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