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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6cae6732c506ca36aab3beb410ecd151962113ddfad37239fecdd1a9b2f30e' 
  AND token = 'OHXs9FAjfw1ksGJSclnWabAyTx/46rUt1jOs7DXVZkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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