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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141209fb899b50aaa3b7bea38cfd1a5cc639d0496df1bd7cc0ea240063ac12f6' 
  AND token = 'XiDMffOT2B+Xr+h6AVwDAonLyyyHcXERW3QMwVVG988=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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