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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14eaaa16025580454b93f74932e00f25306d1b037d74ce1a40afe56f0ead942' 
  AND token = 'Tyqk8N/1jB/kTxhFoYKh0dp4ZNTcFfHnQz1kWdgM3Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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