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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d98974200bf55d7a82f711ad27dfe002c888a096b90a267904ed9cb92f9eba' 
  AND token = '2kYOD+l5XplHl/L+sfN33mClpcedzylmdOLeqqs3644=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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