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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c5a14cbe7d3b644b7fd2f9ca3c481e6d90ba90bcd6a131c3f19ff344af19c0' 
  AND token = 'NS8qWmHl6IUy/iWgTZnUB7r2b17z1LqjEXct3o4zKtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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