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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52a4140a5687b2575ed48521b3f1a28b5fa3e6e47415458a5e71a906f8e6366' 
  AND token = 'cAij+8Ztehfjtq5vIJk/2Z/J+uLn4ChRJW74wK9ocH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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