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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9367cce54ddfc37c8cfa369729c142445360a856a1d37c36fddf1dc5318227ca' 
  AND token = 'ketThshfg04qB6AZwHvlNd82wJFl1gZIiGj0ak16vK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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