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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519b60f6beb71b041f47ce0aab14c447760699ee72d96b65531cbf3d42700979' 
  AND token = 'J2W9B8pWVVQBK8Aof/Af9gFa3OksX5XIY5nL8KwSErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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