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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abe3e451cfd66076f393d70fea20cc400b60b2bb849863c99dabd3a08343ce5' 
  AND token = 'WVteJm1vYhoO8idfDceWOw5ZKNl/hsQF2Vxla2EMMS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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