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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c495dacceb52ab5cb3940d9ad2d4467841ac409b767f9a982475c2b75c59cd07' 
  AND token = 'Khw5ztBnPhgI5LrbZpFpI3XEThK6QLyYgLFG89tPNZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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