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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c5b7c3df562d9cd1300f33d50c05277e813fb93b920f0e1e9965be16f98e56' 
  AND token = 'VeU6jzOHGqo9CMrTzpix2NxijQXOURx/ikIGePOum50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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