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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d4bcc72416de59580af4ee53eae8c843877c3d763d8850c7f1d26d4c79bc3a' 
  AND token = 'FenuGoFEUcTdEu+bjOvTymSuUAdUBaMjz2Gxpg+DHwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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