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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf8c26947e91771225f9347df15cc71685a57331de11c838dc0d72fc1396bb2' 
  AND token = 'yzpqCIOxoMF6QYjVhnrVWTYe/5HfC+WKnIM87y5iYrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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