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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d85aebf5c16710f3c6c64e8f3ff2eb9b8f65b3854766539394b8927ab22627d' 
  AND token = 'yxraK2/Lwk8LVViQbxn+ICeCI2WiAIW2Wu1f8BMbcrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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