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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a0da247a21c7e629ecdaf3923d685fef3946576d82ca24bdeb84b17810e25e' 
  AND token = 'LbR4X7ZQ2DCJVZ9y6b7OeJ7YbUVZP1LStGzRi7iqFQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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