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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ee367f453ad8ba9fdd684ec9e724466c0d31cad39725fcb309dcf1de45fd7a' 
  AND token = 'hvKwC4HGxbigyP+uwK2IBxKaO0smKc2nfANyelo6lSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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