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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079c27ee71d55b5ed05dedba456dcb68753a9a45bc21d24c12611e7031ba3aeb' 
  AND token = 'QpwtjK5BeHt6Z5MiS8aYakeoALu1LAX4gU12xyZbwFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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