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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0297750a30dbc7ab12d9971e3e0a106f59737bac228e3f2ca36643566a8e5c71' 
  AND token = 'qySFfyLCDHv+sxgemU4Dnt7l5PKvK0P18prR6wN1bAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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