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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c960d774ac5afd0e1e55a5f302d0a54332cfc8a320ef85bde6d5861aee9e30' 
  AND token = 'ArPW885HahWvgcITtSxMMo1mMpMGwPb62DwuZDdKFXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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