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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a0f2db0a31d8e0c274dc667b6356d9a1b2016a947d5a23fd73bf0d0c369ef5' 
  AND token = 'pW85tisRPs5nDJRDMevvuGh0Sanc/ZwmAcc7Xa7xlqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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