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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e39ce3cf933889c567ed7b6a947099badc2cb6b3473ae4f9dd71cb377ccf2c' 
  AND token = 'zqjmBADlorOch1d3s7Q9a2l2WQ00K7a67+6zHKUNxNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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