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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782a635ad190d4e4e8e4d794d5b2ac9bf438ab07d0f0ce7c357b41f1081029eb' 
  AND token = 'MIlzBa1XtEHQAlFoDes1O/S422oPpmvl/8zgvNgmX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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