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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da8588f63cab532754da4a6ac9a046c58859c864f29e3f6a2a055c773056a10' 
  AND token = 'VFEvpl9eO7KSwTdRpw2cXAWRdl+95S0M8h8u9At/kg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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