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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd460632575452b3bef4506eae81f1f927342495ec1c00774c01731d78ae1d6a4' 
  AND token = 'hpiYd92kouVHgIrSbRaHMy4HUuDxFocu/X8/r/9kty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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