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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97056614ed1e8770d7e598df9fdec10b5f0cc152e0ee39f8dc7f244bc659e609' 
  AND token = '616ylr8njl8UBeZ4hu2IGzzKjb+uH9ym6+DtECActaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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