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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6da490efb383c282df7b577561247f214a403e3a5616f08fd0c8acb915a876d' 
  AND token = 'r3B3o0cXs0q2tHHdwkja/Abul1Pk7yrowfKdqMhTH4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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