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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a399a30a784655526fc019a6896b3e92b4b331e83c141062518c84215656cd7b' 
  AND token = 'PULG1dYNjLDXUf4QMeMumpttuVCsmtoXVxyGctFZA/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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