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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ba52a291464224714d2263cd90be4e282b83417490fecb0e2dd89a78b28323' 
  AND token = 'yHPmhjrpD27mNZ//3Rpy28N6xouJF+QBagCEevtmp2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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