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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78503c597b169ae032cfc50a5448bca2aa0ff3c24b74c40cce5e13cb49213179' 
  AND token = 'qs2KwQjdrtlN7aE9XucJs/SpzNbr+e3RevNq2aDc+eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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