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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b5bea5d07077eecb0a8e0a3d04b62e53e5d901ec3ad6d4fd2c53a46c382fa5' 
  AND token = 'WcYlTw9TUpP5iAzgrCHowY5/docbWjvtLpUm6F59G78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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