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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8428a90851cd83d759a58d2da199e92a316d69aa4604f9f9df0b6e6408fd9f23' 
  AND token = 'iXz59wDX4HM4UVY084EWoSaThouEKUz0yg74dw+Tj40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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