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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae519161403b00e146de891811662d6229a349d5a85909f6ca7f577693939c3' 
  AND token = '2GkCBQSJPbSArYBNcRVpWFyR5Z9NH9+9IIW1/8X3VEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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