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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c7d8a9426a9064b49dac5d21897ba623998017b86fccb0d3c83ad72219a256' 
  AND token = 'u71PmShgxEP/LM5avKq/Co7xDGy33pEFJmrfhdp5XUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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