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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12cb5e1c069d0f3d2bb60209ca55716685ae23694990572461ff27e11552c40' 
  AND token = '1FzBrv+pw1S8unENuWkhYiER2mYPt6s2/MKYzKaVBWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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