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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91abbfe765a0a6e7a7a95ab5a4d32e4658f4569f6dd1e8f7bb4e367f38db2f14' 
  AND token = 'Kz72v6/ef5f86iXhYirafUwZIQ2l9ilkJE8qPuc8OhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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