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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13041b0cd9ec62722c247c40185afd73257a816326dfa86683a099ac86294c05' 
  AND token = 'SOjVPYrRZYj+V3WOImsz6J9N2meGjYL+Je7O3O3R9nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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