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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6a3f1b025eca8989b6716bb461a305ee08dcc6b493f98076d1713382a73b9f' 
  AND token = 'bcOt+7O+GiNg+5CotWiLww5sjHinDEh9krl6Xw0YGAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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