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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbbd90dfb404dc5a616974b0f865e374e54c29cc6942a24aef1fb42c0c40f98' 
  AND token = 'dNB8dKAsGKzU81gcs//wHHp0GyWZc8pqQpxyZqqkB6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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