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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d7b60e871ed5b8ef56d457b4da71df5c3307e7174dbf9e4c5d3dc058e62141' 
  AND token = 'aMDUrLdA57/PhCvPka+zizsCT6tcGugU3Rj3Mo0TmbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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