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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a603d631cd53692ee570909659eef20ff08bd3017e687be1c22a4610b6579c2' 
  AND token = 'jZoIfpldD7wpTDQGa24qExuppIFc608Kjcqndx3Uy3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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