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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05b4b1d74ea05ef1ad566436a6041af33dc8f0c5850558a16c0b22fc58fba4d' 
  AND token = 't2yViXwERSXVGkjfnbUZEsO9HZwCeTMlFk0UtkXR61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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