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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafea69db7ea0cbb88d2a6a2c56d1924c5bd97143842d8fa5a892567a98741eb' 
  AND token = 'Btx0kRrdgXgcWVrY2Buc4eSq5nBT7LtwwTzJRrNm0qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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