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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28902561d846c05319e8d5c727d2ae3e5919423f869d1702d41daba2014e4026' 
  AND token = 'b8mhl0FnuNfqd5/5FCnJHz7mQaKT7EjGlYMW0RNL2kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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