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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3511b1a867d62799caa8f0caf3999b51ab94bcad39c247dc2d09e0f88f686eb' 
  AND token = 'BmUT5AOa+bfzK11vZUtAYplGDuxGrmiYNcYq0s1YhLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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