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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123fa1ba040fb41a0531419e5661d72780c53de3718bd4e619cefcb7930b01c2' 
  AND token = 'QZ8EUipKW67gWlhXNZVPJPcti0iBDyDx5Rc9H6w2+3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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