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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c256bc94b900b5ee1a263e699a58d34f9c5def42b7a3891ce8993aacc3c18342' 
  AND token = '/UwwA+QgeK64ood+mLBD0P5BqquuPK6Dnbce1AjYFA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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