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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1ef906940516fba48c7256582b72c7c01b4093faa28606e43a093d74e1baf3' 
  AND token = 'KYL8FrznQVdGBM4MguYWROe43argDiBhFBCiIJYkIBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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