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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd9c83babdf8acdd3ba71917b2cb84eedc29d7007fba59c8dac5fa5445a583f' 
  AND token = 'gTh215ZlFwFS+oCEZc9hIxrIU9U3Nqxuh/Zpu1EVcdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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