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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad7c103ab1f87912cd4869c7839e518da84927d9f916962586865099fe281a' 
  AND token = '43QgKj6TpB3WDURT2UezcFDNAhjdqn5rFZzS8zhg7lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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