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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0498893267a5c67e76a6ae83df52598da724724bf3bc16fb80e818f8b05a954a' 
  AND token = 'X7xeEE0YgjcBMr9Q30Zy6bR/a8bDn75mf+0gDAh7Vwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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